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GTasks Sidebar
Google Tasks on sidebar (not official)
Workspace Tab Counter
A tab counter specifically for GX, which counts tabs per workspace too.
Quick History Redux
A Redux (bug fix) for gucio1007's "Quick History". It shows your browsing history in the browser sidebar.
ICQ for Sidebar
Run ICQ Web in Sidebar
KJMZ DA BLAZE
Listen KJMZ DA BLAZE Radio with Opera Browser.
Techmeme Sidebar
Browse technology news on Techmeme in the sidebar.
Headings, Landmarks and Links
View the headings, landmarks and links from a web page in a side panel and export information to CSV formated file.
Landmarks
Allows you to navigate a web page via WAI-ARIA landmarks, using the keyboard or a pop-up menu.
The Stories (sidebar edition)
Smart and beautiful tool for keeping links. Create a story for every ocasion!
MedBizu
Bizus médicos no painel lateral do Opera. Atalhos /hda, /amoxicilina, /qsofa e mais — direto no prontuário.
Blendup
A tool for web developers to preview blend modes on different page elements.